Portable press drill



May 12, 1942. w. SMITH 2,282,535

PORTABLE PRESS DRILL Filed Sept. 16, 1940 2 Sheets-Sheet l V NVENTOR.Z'AZL ATTORNEY.

May 12, 1942. ITH I 2,282,535

PORTABLE PRESS DRILL Filed Sept. 16, 1940 2 Sheets-Sheet 2 M INa VENTOR.BY 7 M-A ATTORNEY.

Patented May 12, 1942 UNlTED STAT PATENT OFFICE PORTABLE PRESS DRILLWalterL. Smith, Likely, Calif. Application September 16, 1940, SerialNo. 356,923

1 Claim.

This invention relates to portable press drills, and the principalobject is to provide in a simple and emcient form,a-portable press drillwith automatic feed devices for pressing the drill to the work. a 1

Another object is to provide a tool of the kind referred to, including avertical standard attachable to a work bench and having a work rest orsupport slidably mounted thereon, the upper end of the standard beingturned horizontally.

over the work rest, and carrying a tubular and threaded feed shaftrotatably passed through its tapped extremity, in operative alignmentwith the work rest, carrying at its lower end a drill chuck unitjournaled thereon, and at its upper end a rigidly connected ratchetgear, a crank operated work shaft extended freely through the feed shaftand anchored to the drill chuck unit, and means for moving the ratchetgear slightly on each complete rotation of the work shaft, for loweringsame slightly towards the work rest.

A preferred embodiment of the invention is shown in the accompanyingdrawings, wherein:

Figure 1 is a side elevation of the tool.

Figure 2 is a top plan View.

Figure 3 is a cross section on the line 3-3 of Figure 1.

Figure 4 is a cross section on the line Figure 1.

The invention comprises a conventional standard 5 threaded at its lowerend 6 and provided with a nut for attachment to a work-bench (notshown). The upper end 8 of the standard is turned laterally at a rightangle 9 and the extremity thereof is tapped as shown at H). Any suitableform of work rest H is adjustably mounted on the standard 5.

Through the tapped end It of the standard, there is rotatably extended atubular, threaded feed shaft l2. A drill chuck unit |3 including atubular shank I4 is rotatably mounted on the lower end of the feedshaft, as shown at |5. The drill chuck unit is of course adapted toreleasably hold a drill l6, and is of conventional structure.

A ratchet gear centrally apertured as at I8, is rigidly anchored to theupper'end of the shaft l2, with the aperture I8 aligned with the bore ofthe shaft. A smaller work shaft 20 is freely passed into the feed shaftl2 and carries a crank arm 2| at its upper end, the crank having ahandle 22. The lower end of the shaft 20, within the shaft |2, is passedinto the tubular shank ll of the drill chuck unit, and there permanentlypinned, as indicated at 23, the pin being passed through the walls ofthe shank and through the shaftZD. Thus the drill chuck-unit may berotated through operation of the crank 2|, and may be loweredtowards thework rest by clockwise rotation of the shaft i2.

A circular cam 24 is rigidly and eccentrically anchored to the shaft 20,above the gear I1, and a pawl carrying arm 25, formed at its inner endwith a circular cut-out 26 for engaging the cam 24, is thereby engagedwith said cam. A pawl 21 is pivotally bolted as shown at 28 to the outerfree end of the arm 25, the working end I of this pawl being placed inoperative juxtaposition with the ratchet gear H, and so as to turn sameclock-wise with the pawl. The arm 25 is also slotted longitudinally and.medially, as shown at 30, for a purpose to be later explained. T

An anchor arm or plate 3| is journ'aled at its inner end as indicated at32 upon the shaft 2|], and an anchor pin 33 has its head rigidly set at33a in the outer end of the arm 3|, while the pin itself is slidablypassed through an aperture 34 pierced through the horizontal end 8 ofthe standard 5. A looped leaf spring 35, anchored at its outer end 35ato the pin 32, has its free end disposed inwardly contiguous and in theplane of movement of the pawl 21, so as to limit the outward movement ofthe said pawl and press same inward upon the gear H. A guide pin 33 isseated at its upper end 36a medially in the margin of the arm 3| firstmet by the clockwise rotated crank 2|, the lower'end of said pindepending freely within the slot 30 of the pawl carrying arm 25.

In lieu of the rigid connection of the crank arm 2| upon the work shaft20, the arm-2| might be journaled to the shaft 20, and a conventionalratchet and pawl unit 31-38, inter posed between the crank and shaft,the ratchet pin 36, and this pin being held stationary by the arm 3|,the resulting oscillating action is, that as said crank arm 2| movesacross and away from the arm 3| to first retract the toe of the pawl 21over the gear H, and then as the crank arm approaches the arm 3| incompleting its circuit, to turn or dip the toe of the pawl inwardlyagainst said rack gear, and to slightly move the gear I! in unison withthe pawl. Since the gear I! is anchored to the tubular feed shaft l2,this shaft is moved slightly downward through the end 8 of the standard5, and the drill l 6 is correspondingly urged into the work on the restll. Thus the drill is simultaneously rotated and urged against the work.The movement of the pin 33 through the standard end 8, is of coursecoincident with the movement of the shaft l2.

It is thought that the construction, use and operation of the tool willbe fully understood from the foregoing description. The embodiment of vthe tool as here shown may of course be changed or modified, within thescope of the claim. I claim:

In a tool of the kind described, a vertical a andfeed shaft, a centrallyapertured ratchet gear anchored concentrically on the upper end of thefeed shaft, a work-shaft passed freely through the tubular feed shaftand locked at its lower end to the drill chuck, a circular cam rigidlyand eccentrically mounted on the upper end of the workshaft, a mediallyand longitudinally slotted pawl carrying arm having a circular cut-outat its inner end and thereby journaled upon said cam of the work-shaftabove the said ratchet gear of the feed shaft, a pawl pivoted throughits heel to the outer end of the pawl carrying arm, the toe of the pawlbeing adapted to traverse the periphery of the ratchet gear, an anchorarm journaled at its inner end to the work shaft above the pawl carryingarm, an anchor pin depended from the outer end of the anchor arm intoslidable engagement with the horizontal end of the standard, a

, guide pin seated medially in the anchor arm and extended freely intothe slot of the pawl carrying arm, and means for resilientlyurging thesaid pawl against the said ratchet gear. I I

, WALTER L. SMITH.

